聚偏二氟乙烯(PVDF)多晶型特征的研究进展

Research Progress in Polyvinylidene Fluoride(PVDF)Polycrystalline Characteristics

聚偏二氟乙烯(PVDF)因具有出色的介电、压电和铁电特性而被广泛应用于储能、传感器和能量收集等领域。PVDF具有多种结晶相,不同晶型对应于不同的分子构象和物理特性。目前,关于在特定条件下何种PVDF晶相占主导、各结晶相所对应的形态特征以及对PVDF物理性能的影响等关键问题尚有争议。本文评述了PVDF的3种主要晶型(α、β和γ)结构特征和目前主流的表征方法,分析了准确建立PVDF多晶型“构-效”关系的难点和潜在途径,并对影响PVDF多晶型形成的因素及转化规律进行了综述。

Polyvinylidene fluoride(PVDF)is widely used in the fields of energy storage,sensors,and energy collection due to its excellent dielectric,piezoelectric,and ferroelectric properties.PVDF has a variety of crystalline phases,which correspond to different molecular conformations and physical properties.At present,there are still controversies about which PVDF crystal phases dominate under certain conditions,the corresponding morphological characteristics of each crystal phase,and the influence on the physical properties of PVDF.This article reviewed the structural characteristics of the three main crystal forms(α,βandγ)of PVDF and the current mainstream characterization methods,and analyzed the difficulties and potential ways to accurately establish the"structure-activity"relationship of PVDF polymorphs.The factors affecting the formation of PVDF polymorphs and the transformation rules were also reviewed.